Assiohob of two-thibds to



E. M. DALEY.

SPRING.

APPLICATION'HLED SEPT. I 1. I915.

Patented Nov. 18, 19 19.

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nan.

specification of licttere Patent. Patntnfl New, til fjl,

Application lllerl teptemlier ll, rein serial No. ,ttt.

To all whom it may concern:

Be it lmown that l, Eowann DA, a citizen of the United States, residinat ll-laverhill, in the county of Essex and State of Massachusetts, haveinvented certain new ducing elements between the leaves thereof...

Another object is the provision of a spring having bearing elementcontaining recesses or grooves elongated on the line of relativemovement of the spring leaves, thus minimizing the space between theleaves and providing reservoirs for the reception of a suitablelubricant.

With these and other objects in view, the invention consists in thenovel construction,

and illustrated in the accompanying drawing, in which: 7

Figure 1 represents a view in side elevation of the improved spring.

Fig 2 represents a transverse sectional view therethrough.

Fig. 3 represents a fragmental plan view of one of the spring leavesremoved, and,

Fig. i represents a fragmentary longitudinal section through the spring.

Referring to the drawing in detail, wherein similar reference numeralsdesignate corresponding parts throughout the several views, thenumeral 5indicates enerally a spring of the usual or any pre erred constructionincluding the main spring 6 and a pluralit of reinforcing elements orleaves 7 rigid y fastened centrally of the main spring 6 by a centerbolt 8. The ends of the main spring 6 are, if desired, looped taprovideheads 9, whereby the ends are secured in position.

The opposite surfaces of the intermediate spring leaves 7 .and the innersurfaces of the upper leaf and main spring 6 are formed with a pluralityof grooves 10 elongated longitudinally of the spring, and in which arearranged bearing balls 11 of adequate size to retain the leaves out ofdirect con tact and thus relieve the same of consider able friction. Theelongated shape" of the grooves 10 obviously permits relative longi-'tudina-l movement of the spring leaves, as when the spring is flexed,and said spring suitable lubricant.

While l have here shown the friction reducing elements in the foruiofballs, l do not limit myself to this particular type as the balls may beobviously replaced by bearing rollers.

What l claim is:

A spring comprising a main spring, a

= plurality of reinforcing leaves rigidly fastened centrally of the mainspring, the intermediate leaves having elongated longi-. tudinallyextending grooves intheir opposite surfaces, the upper leaf and the mainspring having a plurality of elongated longitudinally extending groovesin their inner surfaces in registration with the grooves in the opposedsurfaces of the intermediate leaves, the grooves in the other surfacesof the intermediate leaves being in registration with each other so thatall, of the grooves are arranged in pairs, and bearing balls located inthe pairs of grooves to reduce friction between the leaves and thesprinsaid grooves being of elongated formation to permit free relativelongitudinal movement -of the leaves when the spring and leaves nnwxnnn. nanny.

my signature Witnesses:

ADELBERT D. Srnaen, CLARA EARDSLEY.

65 also constitutes reservoirs for containing a

